I had a close friend in college who was very smart. Got a good job at a bank, won the top performer in the department award for 10 months in a row (when they stopped giving it out), got married, had a kid. He started to dabble in coke. Fast forward to two years later - no job, wife and kid gone, living in the YMCA, every dime spent on coke. Never became a criminal because his fear of jail was about the only thing stronger than his urge to get more coke. We couldn't even give him a few extra bucks to get a decent meal because he'd just buy coke.
Ends up on welfare, disabled, and gets a $17,000 back settlement from Social Security for his disability. In two weeks, he had spent it ALL on coke. He cannot stay away from it though it ruined his career, his marriage, his life, and his second chance to get back on his feet with the settlement money.
He isn't happy about what happened and regrets it terribly. But he simply cannot resist buying coke with any spare money he gets. Even his own family has essentially disowned him because all the money they gave him to help him out was spent on drugs.
He lives in Section 8 projects in a crappy town surrounded by scum. And he hates it, but it's likely he'll be there until he dies of old age.
I would say anyone who would consciously destroy their life for drugs, and hating themselves for it the whole time, is addicted.
First time I've heard cocaine doing this. This story is usually the result of heroin or meth.